Spark-plug.



5.1. ik/MJS:

SPARK HUG.

APPLICATION msn lune 1i. 191s.

vls Patented Jan. 30, 1.91?.

ELIJAH J. WILLIS, F MQREHEA) CITY. NGRTH CAROLINA. ASSIGNGE OF ONE-THRI) TG CHARLES S. WALLACE, 0F MOREHEAD CTY, NORTH CARLM.

SPAEEEELUG.

Talented Jan. Si?, llllil'.

rppleation filed June l, 1916. Serial No. lllll.

To all wwm it may concern:

Be it knovfn that l, Erwan il. llv'iLLis, aV citizen of the United States, and a resident of Morehead City, in the countgv ot Carteret and citate ot' Nin-th Carolina, have invented certain new and useful Improvements in Spark-plugs; and l do hereby declare the following to be a iiull, clear, and exact fleseription of the invention, such as will enable others Skilled in the art to ivhich it app'ertains to niake and use the saine.

Vllhis invention relates to improvements in spark plugs 1for inte lnal combustion en glues.

One object of the invention is to 'so construct the device that it may he readilj)7 adapted for use as a priming cup.

A further object is to provide a spark plug construction whereby the firing pin may loe quickly removed from the casing of the plug and thus permit the casing to he used as a priming cup.

A `i'urther object is to construct the device in such manner that both terminals may he removed 'from the casing so as to facilitate cleaning of the points Without necessity of removing the plug casing from the engine.

A further object is to so construct a spark plugv embodying a removable tiring pin, that said tiring pin can he quickl;7 removed and replaced, and so that when in position in the casing, it shall be scheld in place as to avoid possibility o1 leakage.

lil/"ith these and other objects in view, the invention consists in certain novel features construction and combinations of parts as hereinafter set forth and pointed out in the claiin.

ln the accompanying drawings, Figure l is a view in elevation of the device, with a ,1. portion or thc cap broken away. rig. 2 is a. view in elevation with the cap removed. Fig. 3 is a vertical transverse section, with lhe cap omitted. and Fig. fl is a plan view ol the lockinLy sleeve.

l ren-esente the nlug' casixw having` inte- 1 l i c. r, i,

rior fiat faces to receive :sl-suitable wrench, said easing being also inadevvith a threaded nipple Z to enter the plug opening of the engine cylinder. The main body of the casing i is made `with a cylinder bore which con'nnunication with the smaller bor-:- of the nipple 2.

i firing pin 8 oit Suitable nonconducting material passes througn the casing, the lower or inner end of said tiring pin preferably being cut-away as shown at -l adjacent to the exposed portion of the elec rical conductors 5, which latter passes through a suitable channel in and is carried by the tiring pin. The end of the conductor 5 constituting one of the sparking points, While the other snai-king point is aorded by the projectingr cnil or" a conductor 6. rl"his conductor is also carried by the firing pin 3, andpasses through a suitable channel in the saine as lshown in Fig. 1,-the upper end ot' said conductor being' electricallyv connected with a suitable binding;- post 7 at the upper-end of said firing pin.

The iring pin or insulator 3 is provided intermediate of its ends with an annular flange 8 and the bore of the 'casing l at the juncture of the nipple therewith, is formed with an, annular conical shoulder 9.

l yielding washer or gasket l0 is disposed between the annular flange 8 on the iiring pin or insulator and the conical shoulder 9 in the casing, said gasket also engaging the iring pin below the annular flange and acting as a packing for the saine.

A. locking sleeve l1 is located Within the plug casing and occupies the space hetween the upper portion of the firing pin and the inner iace of the casing", and` between 'the inner end of Said locking sleeve and the ilange on the firing pin, a metal washer 12 is located. As washers of this character are well known, they need not he more Specifica (lescrihed orillustiated. The upper end of the conductor 5 terminates at the upper face oi the annular flange 8 on the firing pin so as to have electrical contact with thc Washer 12 and the latter being in electrical Contact `with the sleeve 11 and easing; l, one sid@ of the sparking circuit will he completed through the engine, asis ivell understood.

The plugiI easing;` i isv provided at dianietricallv opposite sides thereof with slots .i3 having` their upper walls corrugated or roue-honed. llach o these slots isopen at the upper end ol" the casing and is made with an inv-lined cam portion i4". sleeve 1l is provided at diametrically opposite points with arms l5, 15a. to enter the slots 'i8 .and project outwardly beyond the casing suilicient distances to form ringer holds or levers to 'facilitate the manipulation The i of the sleeve. The upper face of the longer handle l is corrugated or roughened to engage the corrugated or roughened wall of one of the slots and thus prevent the sleeve from slipping. In assembling the parts, the firing pin will lirst be passed through the casing and then the sleeve will be inserted y and turned by means of the arms 15,

said arms entering slots 18 and, by coper- 10 '-ation with the cam portions 14: of said slots,

causing the sleeveto press the Washer l2 firmly against the annular iange 8 or the firing pin, and at the same time pressing said"fiange against the packing or gasket l0.

The parts Will now be locked together.

In order to protect the upper end ofthe vstructure from dust and moisture, I employ ing of the saine. When the locking sleeve and firing pin shall have been hrenioved7 the y casing l will be in free communication with Lemmi the interior ol the cylinder and may be used as a priming cup.

Slight 'changes mightv be made in the details of construction of my invention Without departing from the spirit thereof or limiting its scope and hence I do not wish to restrict myself t0 the precise details herein set forth.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is:

A spark plug structure, comprising a plug casing having' slots in its wall7 each slot open at one end and having a cam portion, the upper Walls of the slots being roughened, a removable 'firing pin passing through theA casing and carrying sparking terminals, a locking sleeve for the ring pin located in said casing, said sleeve having arms to pass through the slots in the casing. o e of said arms projecting farther beyond t 1e casing than the other and having a roughened upper tace, .aid arms constituting' linger pieces to faciliiate manipulation of said locking sleeve.

in Atestimony whereof, I have signed this specification 1n the presence of two subscribing Witnesses.

ELIJH J. WILLIS. Witnesses: y

l J. B. ARENDELL, Z. V. BUTTS, Jr. 

